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Kanda, S.; Fukao, Y.; Ikedo, Y.; Ishida, K.; Iwasaki, M.; Kawall, D.; Kawamura, N.; Kojima, K.M.; Kurosawa, N.; Matsuda, Y.; Mibe, T.; Miyake, Y.; Nishimura, S.; Saito, N.; Sato, Y.; Seo, S.; Shimomura, K.; Strasser, P.; Tanaka, K.S.; Tanaka, T.; Torii, H.A.; Toyoda, A.; Ueno, Y.
Physics letters. B, 04/2021, Letnik: 815Journal Article
A hydrogen-like atom consisting of a positive muon and an electron is known as muonium. It is a near-ideal two-body system for a precision test of bound-state theory and fundamental symmetries. The MuSEUM collaboration performed a new precision measurement of the muonium ground-state hyperfine structure at J-PARC using a high-intensity pulsed muon beam and a high-rate capable positron counter. The resonance of hyperfine transition was successfully observed at a near-zero magnetic field, and the muonium hyperfine structure interval of νHFS=4.463302(4)GHz was obtained with a relative precision of 0.9 ppm. The result was consistent with the previous ones obtained at Los Alamos National Laboratory and the current theoretical calculation. We present a demonstration of the microwave spectroscopy of muonium for future experiments to achieve the highest precision.
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